Setup local timezone in logs

In order for user more easily find issues, this MR allows them
to view the logs in their local time.

It also simplifies the spec mock data.

app/assets/javascripts/logs/constants.js

-export const dateFormatMask = 'UTC:mmm dd HH:MM:ss.l"Z"';
+export const dateFormatMask = 'mmm dd HH:MM:ss.l';
 
 export const TOKEN_TYPE_POD_NAME = 'TOKEN_TYPE_POD_NAME';

changelogs/unreleased/214108-log-explorer-timestamp-in-the-logs-presented-in-utc-and-should-be-.yml

+---
+title: Display local timezone in log explorer
+merge_request: 29409
+author:
+type: changed

spec/features/projects/environments_pod_logs_spec.rb

@@ -57,7 +57,9 @@ describe 'Environment > Pod Logs', :js do
           expect(item.text).to eq(pod_names[i])
         end
       end
-      expect(page).to have_content("Dec 13 14:04:22.123Z | kube-pod | Log 1 Dec 13 14:04:23.123Z | kube-pod | Log 2 Dec 13 14:04:24.123Z | kube-pod | Log 3")
+      expect(page).to have_content("kube-pod | Log 1")
+      expect(page).to have_content("kube-pod | Log 2")
+      expect(page).to have_content("kube-pod | Log 3")
     end
   end
 end

spec/frontend/logs/mock_data.js

@@ -34,91 +34,31 @@ export const mockPods = [
 export const mockLogsResult = [
   {
     timestamp: '2019-12-13T13:43:18.2760123Z',
-    message: '10.36.0.1 - - [16/Oct/2019:06:29:48 UTC] "GET / HTTP/1.1" 200 13',
+    message: 'log line 1',
     pod: 'foo',
   },
   {
     timestamp: '2019-12-13T13:43:18.2760123Z',
-    message: '- -> /',
+    message: 'log line A',
     pod: 'bar',
   },
   {
     timestamp: '2019-12-13T13:43:26.8420123Z',
-    message: '10.36.0.1 - - [16/Oct/2019:06:29:57 UTC] "GET / HTTP/1.1" 200 13',
+    message: 'log line 2',
     pod: 'foo',
   },
   {
     timestamp: '2019-12-13T13:43:26.8420123Z',
-    message: '- -> /',
-    pod: 'bar',
-  },
-  {
-    timestamp: '2019-12-13T13:43:28.3710123Z',
-    message: '10.36.0.1 - - [16/Oct/2019:06:29:58 UTC] "GET / HTTP/1.1" 200 13',
-    pod: 'foo',
-  },
-  {
-    timestamp: '2019-12-13T13:43:28.3710123Z',
-    message: '- -> /',
-    pod: 'bar',
-  },
-  {
-    timestamp: '2019-12-13T13:43:36.8860123Z',
-    message: '10.36.0.1 - - [16/Oct/2019:06:30:07 UTC] "GET / HTTP/1.1" 200 13',
-    pod: 'foo',
-  },
-  {
-    timestamp: '2019-12-13T13:43:36.8860123Z',
-    message: '- -> /',
-    pod: 'bar',
-  },
-  {
-    timestamp: '2019-12-13T13:43:38.4000123Z',
-    message: '10.36.0.1 - - [16/Oct/2019:06:30:08 UTC] "GET / HTTP/1.1" 200 13',
-    pod: 'foo',
-  },
-  {
-    timestamp: '2019-12-13T13:43:38.4000123Z',
-    message: '- -> /',
-    pod: 'bar',
-  },
-  {
-    timestamp: '2019-12-13T13:43:46.8420123Z',
-    message: '10.36.0.1 - - [16/Oct/2019:06:30:17 UTC] "GET / HTTP/1.1" 200 13',
-    pod: 'foo',
-  },
-  {
-    timestamp: '2019-12-13T13:43:46.8430123Z',
-    message: '- -> /',
-    pod: 'bar',
-  },
-  {
-    timestamp: '2019-12-13T13:43:48.3240123Z',
-    message: '10.36.0.1 - - [16/Oct/2019:06:30:18 UTC] "GET / HTTP/1.1" 200 13',
-    pod: 'foo',
-  },
-  {
-    timestamp: '2019-12-13T13:43:48.3250123Z',
-    message: '- -> /',
+    message: 'log line B',
     pod: 'bar',
   },
 ];
 
 export const mockTrace = [
-  'Dec 13 13:43:18.276Z | foo | 10.36.0.1 - - [16/Oct/2019:06:29:48 UTC] "GET / HTTP/1.1" 200 13',
-  'Dec 13 13:43:18.276Z | bar | - -> /',
-  'Dec 13 13:43:26.842Z | foo | 10.36.0.1 - - [16/Oct/2019:06:29:57 UTC] "GET / HTTP/1.1" 200 13',
-  'Dec 13 13:43:26.842Z | bar | - -> /',
-  'Dec 13 13:43:28.371Z | foo | 10.36.0.1 - - [16/Oct/2019:06:29:58 UTC] "GET / HTTP/1.1" 200 13',
-  'Dec 13 13:43:28.371Z | bar | - -> /',
-  'Dec 13 13:43:36.886Z | foo | 10.36.0.1 - - [16/Oct/2019:06:30:07 UTC] "GET / HTTP/1.1" 200 13',
-  'Dec 13 13:43:36.886Z | bar | - -> /',
-  'Dec 13 13:43:38.400Z | foo | 10.36.0.1 - - [16/Oct/2019:06:30:08 UTC] "GET / HTTP/1.1" 200 13',
-  'Dec 13 13:43:38.400Z | bar | - -> /',
-  'Dec 13 13:43:46.842Z | foo | 10.36.0.1 - - [16/Oct/2019:06:30:17 UTC] "GET / HTTP/1.1" 200 13',
-  'Dec 13 13:43:46.843Z | bar | - -> /',
-  'Dec 13 13:43:48.324Z | foo | 10.36.0.1 - - [16/Oct/2019:06:30:18 UTC] "GET / HTTP/1.1" 200 13',
-  'Dec 13 13:43:48.325Z | bar | - -> /',
+  'Dec 13 13:43:18.276 | foo | log line 1',
+  'Dec 13 13:43:18.276 | bar | log line A',
+  'Dec 13 13:43:26.842 | foo | log line 2',
+  'Dec 13 13:43:26.842 | bar | log line B',
 ];
 
 export const mockResponse = {